PlanetHeartbeatEARTH HISTORY / V3.3.0
50 MILESTONES · DEEP TIME · PHYSICAL EVIDENCE
Explore the planet's changing rocks, oceans, atmosphere and life. Learn which dates are geological boundaries, which are estimates and where evidence is still debated.
Timeline positions are approximate educational anchors, not continuously observed measurements. Some events took millions of years, and some ages are debated. All times below are millions of years before present (Ma).
IF ALL OF EARTH'S HISTORY WERE ONE DAY
This is a linear compression of roughly 4,540 million years into 86,400 seconds. Very recent events crowd near midnight; use the alternative logarithmic ruler below to examine them.
No results for these filters.
Caution: “Approximate” dates indicate educational estimates, not exact moments. “Boundary” marks a time-scale convention; debate remains for some proposed events.
OPEN GEOLOGICAL REFERENCE ↗References provide authoritative context, not exact confirmation of each educational date. When scholarly estimates differ, consult the underlying literature.
Use “Add to compare” on two events. Time gaps are approximate and refer to selected reference ages, not durations of complex processes.
TWO-MILESTONE CHALLENGE
Practice interpreting geological time. Your personal score stays in this browser.
Choose “New question” to test your knowledge.
Download the 50-event timeline with sources, or a separate private backup of bookmarks, progress and notes. Shared timeline exports never contain private notes.